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-rw-r--r--synapse/handlers/typing.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
index 861b8f7989..5589296c09 100644
--- a/synapse/handlers/typing.py
+++ b/synapse/handlers/typing.py
@@ -221,6 +221,9 @@ class TypingHandler(object):
 
     def get_all_typing_updates(self, last_id, current_id):
         # TODO: Work out a way to do this without scanning the entire state.
+        if last_id == current_id:
+            return []
+
         rows = []
         for room_id, serial in self._room_serials.items():
             if last_id < serial and serial <= current_id: